Question

Which of the following options best depicts the flow of information when a gene directs the synthesis of a cellular component?

A) RNA → DNA → RNA → protein
B) DNA → RNA → protein
C) protein → RNA → DNA
D) DNA → tRNA → mRNA → protein

Answer 1

Answer:

B) DNA - RNA - protein

Explanation:

Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product, usually protein.  Gene expression include steps such as  

• transcription – part of DNA is copied into mRNA via an enzyme RNA polymerase

• RNA splicing – formed mRNA during transcription is not mature so it need to be proceed (e.g. excision of introns). Mature mRNA are then exported from nucleus to cytoplasm

• Translation – mRNA serves as information that codes for the synthesis of one or more proteins.